RaspiCameraLivestream

Open your terminal and type:

sudo python -m pip install rpistream
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Open cmd as admin and type:

pip install rpistream
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Server

from rpistream.camera import Camera
from rpistream.streamserver import Server
import cv2

def retrieveImage(cam,imgResize):
    image = cv2.resize(cam.image,(0,0),fx=imgResize,fy=imgResize)
    return image

cam = Camera(mirror=True)
scale=0.5
server = Server(port=5000)
server.serve() # Blocking; waits for a connection before continuing
server.startStream(retrieveImage,[cam,scale]) # Calls retrieveImage(*args) every frame  
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Client

from rpistream.streamclient import Client
import cv2

client = Client(serverIp="localhost", port = 5000) # Connects to the server
client.startStream() # Starts recieving data and displaying the video
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